net/mac80211/iface.c

   1 /*
   2  * Interface handling (except master interface)
   3  *
   4  * Copyright 2002-2005, Instant802 Networks, Inc.
   5  * Copyright 2005-2006, Devicescape Software, Inc.
   6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <net/mac80211.h>
  19 #include <net/ieee80211_radiotap.h>
  20 #include "ieee80211_i.h"
  21 #include "sta_info.h"
  22 #include "debugfs_netdev.h"
  23 #include "mesh.h"
  24 #include "led.h"
  25 #include "driver-ops.h"
  26 #include "wme.h"
  27 #include "rate.h"
  28
  29 /**
  30  * DOC: Interface list locking
  31  *
  32  * The interface list in each struct ieee80211_local is protected
  33  * three-fold:
  34  *
  35  * (1) modifications may only be done under the RTNL
  36  * (2) modifications and readers are protected against each other by
  37  *     the iflist_mtx.
  38  * (3) modifications are done in an RCU manner so atomic readers
  39  *     can traverse the list in RCU-safe blocks.
  40  *
  41  * As a consequence, reads (traversals) of the list can be protected
  42  * by either the RTNL, the iflist_mtx or RCU.
  43  */
  44
  45 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  46 {
  47         struct ieee80211_chanctx_conf *chanctx_conf;
  48         int power;
  49
  50         rcu_read_lock();
  51         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  52         if (!chanctx_conf) {
  53                 rcu_read_unlock();
  54                 return false;
  55         }
  56
  57         power = chanctx_conf->def.chan->max_power;
  58         rcu_read_unlock();
  59
  60         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  61                 power = min(power, sdata->user_power_level);
  62
  63         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  64                 power = min(power, sdata->ap_power_level);
  65
  66         if (power != sdata->vif.bss_conf.txpower) {
  67                 sdata->vif.bss_conf.txpower = power;
  68                 ieee80211_hw_config(sdata->local, 0);
  69                 return true;
  70         }
  71
  72         return false;
  73 }
  74
  75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  76 {
  77         if (__ieee80211_recalc_txpower(sdata))
  78                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  79 }
  80
  81 static u32 ieee80211_idle_off(struct ieee80211_local *local,
  82                               const char *reason)
  83 {
  84         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  85                 return 0;
  86
  87         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  88         return IEEE80211_CONF_CHANGE_IDLE;
  89 }
  90
  91 static u32 ieee80211_idle_on(struct ieee80211_local *local)
  92 {
  93         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  94                 return 0;
  95
  96         drv_flush(local, false);
  97
  98         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
  99         return IEEE80211_CONF_CHANGE_IDLE;
 100 }
 101
 102 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
 103 {
 104         struct ieee80211_sub_if_data *sdata;
 105         int count = 0;
 106         bool working = false, scanning = false;
 107         unsigned int led_trig_start = 0, led_trig_stop = 0;
 108         struct ieee80211_roc_work *roc;
 109
 110 #ifdef CONFIG_PROVE_LOCKING
 111         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
 112                 !lockdep_is_held(&local->iflist_mtx));
 113 #endif
 114         lockdep_assert_held(&local->mtx);
 115
 116         list_for_each_entry(sdata, &local->interfaces, list) {
 117                 if (!ieee80211_sdata_running(sdata)) {
 118                         sdata->vif.bss_conf.idle = true;
 119                         continue;
 120                 }
 121
 122                 sdata->old_idle = sdata->vif.bss_conf.idle;
 123
 124                 /* do not count disabled managed interfaces */
 125                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 126                     !sdata->u.mgd.associated &&
 127                     !sdata->u.mgd.auth_data &&
 128                     !sdata->u.mgd.assoc_data) {
 129                         sdata->vif.bss_conf.idle = true;
 130                         continue;
 131                 }
 132                 /* do not count unused IBSS interfaces */
 133                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 134                     !sdata->u.ibss.ssid_len) {
 135                         sdata->vif.bss_conf.idle = true;
 136                         continue;
 137                 }
 138
 139                 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
 140                         continue;
 141
 142                 /* count everything else */
 143                 sdata->vif.bss_conf.idle = false;
 144                 count++;
 145         }
 146
 147         if (!local->ops->remain_on_channel) {
 148                 list_for_each_entry(roc, &local->roc_list, list) {
 149                         working = true;
 150                         roc->sdata->vif.bss_conf.idle = false;
 151                 }
 152         }
 153
 154         sdata = rcu_dereference_protected(local->scan_sdata,
 155                                           lockdep_is_held(&local->mtx));
 156         if (sdata && !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
 157                 scanning = true;
 158                 sdata->vif.bss_conf.idle = false;
 159         }
 160
 161         list_for_each_entry(sdata, &local->interfaces, list) {
 162                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 163                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
 164                     sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
 165                         continue;
 166                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
 167                         continue;
 168                 if (!ieee80211_sdata_running(sdata))
 169                         continue;
 170                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
 171         }
 172
 173         if (working || scanning)
 174                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 175         else
 176                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 177
 178         if (count)
 179                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 180         else
 181                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 182
 183         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 184
 185         if (working)
 186                 return ieee80211_idle_off(local, "working");
 187         if (scanning)
 188                 return ieee80211_idle_off(local, "scanning");
 189         if (!count)
 190                 return ieee80211_idle_on(local);
 191         else
 192                 return ieee80211_idle_off(local, "in use");
 193
 194         return 0;
 195 }
 196
 197 void ieee80211_recalc_idle(struct ieee80211_local *local)
 198 {
 199         u32 chg;
 200
 201         mutex_lock(&local->iflist_mtx);
 202         chg = __ieee80211_recalc_idle(local);
 203         mutex_unlock(&local->iflist_mtx);
 204         if (chg)
 205                 ieee80211_hw_config(local, chg);
 206 }
 207
 208 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 209 {
 210         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
 211                 return -EINVAL;
 212
 213         dev->mtu = new_mtu;
 214         return 0;
 215 }
 216
 217 static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
 218 {
 219         struct ieee80211_sub_if_data *sdata;
 220         u64 new, mask, tmp;
 221         u8 *m;
 222         int ret = 0;
 223
 224         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 225                 return 0;
 226
 227         m = addr;
 228         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 229                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 230                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 231
 232         m = local->hw.wiphy->addr_mask;
 233         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 234                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 235                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 236
 237
 238         mutex_lock(&local->iflist_mtx);
 239         list_for_each_entry(sdata, &local->interfaces, list) {
 240                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
 241                         continue;
 242
 243                 m = sdata->vif.addr;
 244                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 245                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 246                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 247
 248                 if ((new & ~mask) != (tmp & ~mask)) {
 249                         ret = -EINVAL;
 250                         break;
 251                 }
 252         }
 253         mutex_unlock(&local->iflist_mtx);
 254
 255         return ret;
 256 }
 257
 258 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 259 {
 260         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 261         struct sockaddr *sa = addr;
 262         int ret;
 263
 264         if (ieee80211_sdata_running(sdata))
 265                 return -EBUSY;
 266
 267         ret = ieee80211_verify_mac(sdata->local, sa->sa_data);
 268         if (ret)
 269                 return ret;
 270
 271         ret = eth_mac_addr(dev, sa);
 272
 273         if (ret == 0)
 274                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 275
 276         return ret;
 277 }
 278
 279 static inline int identical_mac_addr_allowed(int type1, int type2)
 280 {
 281         return type1 == NL80211_IFTYPE_MONITOR ||
 282                 type2 == NL80211_IFTYPE_MONITOR ||
 283                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 284                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 285                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 286                 (type1 == NL80211_IFTYPE_WDS &&
 287                         (type2 == NL80211_IFTYPE_WDS ||
 288                          type2 == NL80211_IFTYPE_AP)) ||
 289                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 290                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 291                         (type2 == NL80211_IFTYPE_AP ||
 292                          type2 == NL80211_IFTYPE_AP_VLAN));
 293 }
 294
 295 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 296                                             enum nl80211_iftype iftype)
 297 {
 298         struct ieee80211_local *local = sdata->local;
 299         struct ieee80211_sub_if_data *nsdata;
 300
 301         ASSERT_RTNL();
 302
 303         /* we hold the RTNL here so can safely walk the list */
 304         list_for_each_entry(nsdata, &local->interfaces, list) {
 305                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 306                         /*
 307                          * Allow only a single IBSS interface to be up at any
 308                          * time. This is restricted because beacon distribution
 309                          * cannot work properly if both are in the same IBSS.
 310                          *
 311                          * To remove this restriction we'd have to disallow them
 312                          * from setting the same SSID on different IBSS interfaces
 313                          * belonging to the same hardware. Then, however, we're
 314                          * faced with having to adopt two different TSF timers...
 315                          */
 316                         if (iftype == NL80211_IFTYPE_ADHOC &&
 317                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 318                                 return -EBUSY;
 319
 320                         /*
 321                          * The remaining checks are only performed for interfaces
 322                          * with the same MAC address.
 323                          */
 324                         if (!ether_addr_equal(sdata->vif.addr,
 325                                               nsdata->vif.addr))
 326                                 continue;
 327
 328                         /*
 329                          * check whether it may have the same address
 330                          */
 331                         if (!identical_mac_addr_allowed(iftype,
 332                                                         nsdata->vif.type))
 333                                 return -ENOTUNIQ;
 334
 335                         /*
 336                          * can only add VLANs to enabled APs
 337                          */
 338                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 339                             nsdata->vif.type == NL80211_IFTYPE_AP)
 340                                 sdata->bss = &nsdata->u.ap;
 341                 }
 342         }
 343
 344         return 0;
 345 }
 346
 347 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
 348 {
 349         int n_queues = sdata->local->hw.queues;
 350         int i;
 351
 352         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
 353                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 354                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 355                                          IEEE80211_INVAL_HW_QUEUE))
 356                                 return -EINVAL;
 357                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 358                                          n_queues))
 359                                 return -EINVAL;
 360                 }
 361         }
 362
 363         if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
 364             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 365                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 366                 return 0;
 367         }
 368
 369         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 370                 return -EINVAL;
 371
 372         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 373                 return -EINVAL;
 374
 375         return 0;
 376 }
 377
 378 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 379                                     const int offset)
 380 {
 381         struct ieee80211_local *local = sdata->local;
 382         u32 flags = sdata->u.mntr_flags;
 383
 384 #define ADJUST(_f, _s)  do {                                    \
 385         if (flags & MONITOR_FLAG_##_f)                          \
 386                 local->fif_##_s += offset;                      \
 387         } while (0)
 388
 389         ADJUST(FCSFAIL, fcsfail);
 390         ADJUST(PLCPFAIL, plcpfail);
 391         ADJUST(CONTROL, control);
 392         ADJUST(CONTROL, pspoll);
 393         ADJUST(OTHER_BSS, other_bss);
 394
 395 #undef ADJUST
 396 }
 397
 398 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 399 {
 400         struct ieee80211_local *local = sdata->local;
 401         int i;
 402
 403         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 404                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 405                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 406                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 407                         sdata->vif.hw_queue[i] = i;
 408                 else
 409                         sdata->vif.hw_queue[i] = 0;
 410         }
 411         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 412 }
 413
 414 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 415 {
 416         struct ieee80211_sub_if_data *sdata;
 417         int ret = 0;
 418
 419         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 420                 return 0;
 421
 422         mutex_lock(&local->iflist_mtx);
 423
 424         if (local->monitor_sdata)
 425                 goto out_unlock;
 426
 427         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 428         if (!sdata) {
 429                 ret = -ENOMEM;
 430                 goto out_unlock;
 431         }
 432
 433         /* set up data */
 434         sdata->local = local;
 435         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 436         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 437                  wiphy_name(local->hw.wiphy));
 438
 439         ieee80211_set_default_queues(sdata);
 440
 441         ret = drv_add_interface(local, sdata);
 442         if (WARN_ON(ret)) {
 443                 /* ok .. stupid driver, it asked for this! */
 444                 kfree(sdata);
 445                 goto out_unlock;
 446         }
 447
 448         ret = ieee80211_check_queues(sdata);
 449         if (ret) {
 450                 kfree(sdata);
 451                 goto out_unlock;
 452         }
 453
 454         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 455                                         IEEE80211_CHANCTX_EXCLUSIVE);
 456         if (ret) {
 457                 drv_remove_interface(local, sdata);
 458                 kfree(sdata);
 459                 goto out_unlock;
 460         }
 461
 462         rcu_assign_pointer(local->monitor_sdata, sdata);
 463  out_unlock:
 464         mutex_unlock(&local->iflist_mtx);
 465         return ret;
 466 }
 467
 468 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 469 {
 470         struct ieee80211_sub_if_data *sdata;
 471
 472         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 473                 return;
 474
 475         mutex_lock(&local->iflist_mtx);
 476
 477         sdata = rcu_dereference_protected(local->monitor_sdata,
 478                                           lockdep_is_held(&local->iflist_mtx));
 479         if (!sdata)
 480                 goto out_unlock;
 481
 482         rcu_assign_pointer(local->monitor_sdata, NULL);
 483         synchronize_net();
 484
 485         ieee80211_vif_release_channel(sdata);
 486
 487         drv_remove_interface(local, sdata);
 488
 489         kfree(sdata);
 490  out_unlock:
 491         mutex_unlock(&local->iflist_mtx);
 492 }
 493
 494 /*
 495  * NOTE: Be very careful when changing this function, it must NOT return
 496  * an error on interface type changes that have been pre-checked, so most
 497  * checks should be in ieee80211_check_concurrent_iface.
 498  */
 499 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 500 {
 501         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 502         struct net_device *dev = wdev->netdev;
 503         struct ieee80211_local *local = sdata->local;
 504         struct sta_info *sta;
 505         u32 changed = 0;
 506         int res;
 507         u32 hw_reconf_flags = 0;
 508
 509         switch (sdata->vif.type) {
 510         case NL80211_IFTYPE_WDS:
 511                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 512                         return -ENOLINK;
 513                 break;
 514         case NL80211_IFTYPE_AP_VLAN: {
 515                 struct ieee80211_sub_if_data *master;
 516
 517                 if (!sdata->bss)
 518                         return -ENOLINK;
 519
 520                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 521
 522                 master = container_of(sdata->bss,
 523                                       struct ieee80211_sub_if_data, u.ap);
 524                 sdata->control_port_protocol =
 525                         master->control_port_protocol;
 526                 sdata->control_port_no_encrypt =
 527                         master->control_port_no_encrypt;
 528                 break;
 529                 }
 530         case NL80211_IFTYPE_AP:
 531                 sdata->bss = &sdata->u.ap;
 532                 break;
 533         case NL80211_IFTYPE_MESH_POINT:
 534         case NL80211_IFTYPE_STATION:
 535         case NL80211_IFTYPE_MONITOR:
 536         case NL80211_IFTYPE_ADHOC:
 537         case NL80211_IFTYPE_P2P_DEVICE:
 538                 /* no special treatment */
 539                 break;
 540         case NL80211_IFTYPE_UNSPECIFIED:
 541         case NUM_NL80211_IFTYPES:
 542         case NL80211_IFTYPE_P2P_CLIENT:
 543         case NL80211_IFTYPE_P2P_GO:
 544                 /* cannot happen */
 545                 WARN_ON(1);
 546                 break;
 547         }
 548
 549         if (local->open_count == 0) {
 550                 res = drv_start(local);
 551                 if (res)
 552                         goto err_del_bss;
 553                 if (local->ops->napi_poll)
 554                         napi_enable(&local->napi);
 555                 /* we're brought up, everything changes */
 556                 hw_reconf_flags = ~0;
 557                 ieee80211_led_radio(local, true);
 558                 ieee80211_mod_tpt_led_trig(local,
 559                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 560         }
 561
 562         /*
 563          * Copy the hopefully now-present MAC address to
 564          * this interface, if it has the special null one.
 565          */
 566         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 567                 memcpy(dev->dev_addr,
 568                        local->hw.wiphy->perm_addr,
 569                        ETH_ALEN);
 570                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 571
 572                 if (!is_valid_ether_addr(dev->dev_addr)) {
 573                         res = -EADDRNOTAVAIL;
 574                         goto err_stop;
 575                 }
 576         }
 577
 578         switch (sdata->vif.type) {
 579         case NL80211_IFTYPE_AP_VLAN:
 580                 /* no need to tell driver, but set carrier and chanctx */
 581                 if (rtnl_dereference(sdata->bss->beacon)) {
 582                         ieee80211_vif_vlan_copy_chanctx(sdata);
 583                         netif_carrier_on(dev);
 584                 } else {
 585                         netif_carrier_off(dev);
 586                 }
 587                 break;
 588         case NL80211_IFTYPE_MONITOR:
 589                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 590                         local->cooked_mntrs++;
 591                         break;
 592                 }
 593
 594                 if (local->monitors == 0 && local->open_count == 0) {
 595                         res = ieee80211_add_virtual_monitor(local);
 596                         if (res)
 597                                 goto err_stop;
 598                 }
 599
 600                 /* must be before the call to ieee80211_configure_filter */
 601                 local->monitors++;
 602                 if (local->monitors == 1) {
 603                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 604                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 605                 }
 606
 607                 ieee80211_adjust_monitor_flags(sdata, 1);
 608                 ieee80211_configure_filter(local);
 609
 610                 netif_carrier_on(dev);
 611                 break;
 612         default:
 613                 if (coming_up) {
 614                         ieee80211_del_virtual_monitor(local);
 615
 616                         res = drv_add_interface(local, sdata);
 617                         if (res)
 618                                 goto err_stop;
 619                         res = ieee80211_check_queues(sdata);
 620                         if (res)
 621                                 goto err_del_interface;
 622                 }
 623
 624                 drv_add_interface_debugfs(local, sdata);
 625
 626                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 627                         local->fif_pspoll++;
 628                         local->fif_probe_req++;
 629
 630                         ieee80211_configure_filter(local);
 631                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 632                         local->fif_probe_req++;
 633                 }
 634
 635                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 636                         changed |= ieee80211_reset_erp_info(sdata);
 637                 ieee80211_bss_info_change_notify(sdata, changed);
 638
 639                 switch (sdata->vif.type) {
 640                 case NL80211_IFTYPE_STATION:
 641                 case NL80211_IFTYPE_ADHOC:
 642                 case NL80211_IFTYPE_AP:
 643                 case NL80211_IFTYPE_MESH_POINT:
 644                         netif_carrier_off(dev);
 645                         break;
 646                 case NL80211_IFTYPE_WDS:
 647                 case NL80211_IFTYPE_P2P_DEVICE:
 648                         break;
 649                 default:
 650                         netif_carrier_on(dev);
 651                 }
 652
 653                 /*
 654                  * set default queue parameters so drivers don't
 655                  * need to initialise the hardware if the hardware
 656                  * doesn't start up with sane defaults
 657                  */
 658                 ieee80211_set_wmm_default(sdata, true);
 659         }
 660
 661         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 662
 663         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 664                 /* Create STA entry for the WDS peer */
 665                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 666                                      GFP_KERNEL);
 667                 if (!sta) {
 668                         res = -ENOMEM;
 669                         goto err_del_interface;
 670                 }
 671
 672                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 673                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 674                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 675
 676                 res = sta_info_insert(sta);
 677                 if (res) {
 678                         /* STA has been freed */
 679                         goto err_del_interface;
 680                 }
 681
 682                 rate_control_rate_init(sta);
 683                 netif_carrier_on(dev);
 684         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 685                 rcu_assign_pointer(local->p2p_sdata, sdata);
 686         }
 687
 688         /*
 689          * set_multicast_list will be invoked by the networking core
 690          * which will check whether any increments here were done in
 691          * error and sync them down to the hardware as filter flags.
 692          */
 693         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 694                 atomic_inc(&local->iff_allmultis);
 695
 696         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 697                 atomic_inc(&local->iff_promiscs);
 698
 699         mutex_lock(&local->mtx);
 700         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 701         mutex_unlock(&local->mtx);
 702
 703         if (coming_up)
 704                 local->open_count++;
 705
 706         if (hw_reconf_flags)
 707                 ieee80211_hw_config(local, hw_reconf_flags);
 708
 709         ieee80211_recalc_ps(local, -1);
 710
 711         if (dev)
 712                 netif_tx_start_all_queues(dev);
 713
 714         return 0;
 715  err_del_interface:
 716         drv_remove_interface(local, sdata);
 717  err_stop:
 718         if (!local->open_count)
 719                 drv_stop(local);
 720  err_del_bss:
 721         sdata->bss = NULL;
 722         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 723                 list_del(&sdata->u.vlan.list);
 724         /* might already be clear but that doesn't matter */
 725         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 726         return res;
 727 }
 728
 729 static int ieee80211_open(struct net_device *dev)
 730 {
 731         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 732         int err;
 733
 734         /* fail early if user set an invalid address */
 735         if (!is_valid_ether_addr(dev->dev_addr))
 736                 return -EADDRNOTAVAIL;
 737
 738         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 739         if (err)
 740                 return err;
 741
 742         return ieee80211_do_open(&sdata->wdev, true);
 743 }
 744
 745 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 746                               bool going_down)
 747 {
 748         struct ieee80211_local *local = sdata->local;
 749         unsigned long flags;
 750         struct sk_buff *skb, *tmp;
 751         u32 hw_reconf_flags = 0;
 752         int i, flushed;
 753
 754         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 755
 756         if (rcu_access_pointer(local->scan_sdata) == sdata)
 757                 ieee80211_scan_cancel(local);
 758
 759         /*
 760          * Stop TX on this interface first.
 761          */
 762         if (sdata->dev)
 763                 netif_tx_stop_all_queues(sdata->dev);
 764
 765         ieee80211_roc_purge(sdata);
 766
 767         /*
 768          * Remove all stations associated with this interface.
 769          *
 770          * This must be done before calling ops->remove_interface()
 771          * because otherwise we can later invoke ops->sta_notify()
 772          * whenever the STAs are removed, and that invalidates driver
 773          * assumptions about always getting a vif pointer that is valid
 774          * (because if we remove a STA after ops->remove_interface()
 775          * the driver will have removed the vif info already!)
 776          *
 777          * This is relevant only in WDS mode, in all other modes we've
 778          * already removed all stations when disconnecting or similar,
 779          * so warn otherwise.
 780          *
 781          * We call sta_info_flush_cleanup() later, to combine RCU waits.
 782          */
 783         flushed = sta_info_flush_defer(sdata);
 784         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 785                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 786
 787         /*
 788          * Don't count this interface for promisc/allmulti while it
 789          * is down. dev_mc_unsync() will invoke set_multicast_list
 790          * on the master interface which will sync these down to the
 791          * hardware as filter flags.
 792          */
 793         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 794                 atomic_dec(&local->iff_allmultis);
 795
 796         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 797                 atomic_dec(&local->iff_promiscs);
 798
 799         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 800                 local->fif_pspoll--;
 801                 local->fif_probe_req--;
 802         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 803                 local->fif_probe_req--;
 804         }
 805
 806         if (sdata->dev) {
 807                 netif_addr_lock_bh(sdata->dev);
 808                 spin_lock_bh(&local->filter_lock);
 809                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 810                                  sdata->dev->addr_len);
 811                 spin_unlock_bh(&local->filter_lock);
 812                 netif_addr_unlock_bh(sdata->dev);
 813
 814                 ieee80211_configure_filter(local);
 815         }
 816
 817         del_timer_sync(&local->dynamic_ps_timer);
 818         cancel_work_sync(&local->dynamic_ps_enable_work);
 819
 820         cancel_work_sync(&sdata->recalc_smps);
 821
 822         /* APs need special treatment */
 823         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 824                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 825
 826                 /* down all dependent devices, that is VLANs */
 827                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 828                                          u.vlan.list)
 829                         dev_close(vlan->dev);
 830                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 831         } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 832                 ieee80211_mgd_stop(sdata);
 833         }
 834
 835         if (going_down)
 836                 local->open_count--;
 837
 838         switch (sdata->vif.type) {
 839         case NL80211_IFTYPE_AP_VLAN:
 840                 list_del(&sdata->u.vlan.list);
 841                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
 842                 /* no need to tell driver */
 843                 break;
 844         case NL80211_IFTYPE_MONITOR:
 845                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 846                         local->cooked_mntrs--;
 847                         break;
 848                 }
 849
 850                 local->monitors--;
 851                 if (local->monitors == 0) {
 852                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 853                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 854                         ieee80211_del_virtual_monitor(local);
 855                 }
 856
 857                 ieee80211_adjust_monitor_flags(sdata, -1);
 858                 ieee80211_configure_filter(local);
 859                 break;
 860         case NL80211_IFTYPE_P2P_DEVICE:
 861                 /* relies on synchronize_rcu() below */
 862                 rcu_assign_pointer(local->p2p_sdata, NULL);
 863                 /* fall through */
 864         default:
 865                 cancel_work_sync(&sdata->work);
 866                 /*
 867                  * When we get here, the interface is marked down.
 868                  *
 869                  * sta_info_flush_cleanup() requires rcu_barrier()
 870                  * first to wait for the station call_rcu() calls
 871                  * to complete, here we need at least sychronize_rcu()
 872                  * it to wait for the RX path in case it is using the
 873                  * interface and enqueuing frames at this very time on
 874                  * another CPU.
 875                  */
 876                 rcu_barrier();
 877                 sta_info_flush_cleanup(sdata);
 878
 879                 skb_queue_purge(&sdata->skb_queue);
 880
 881                 /*
 882                  * Free all remaining keys, there shouldn't be any,
 883                  * except maybe group keys in AP more or WDS?
 884                  */
 885                 ieee80211_free_keys(sdata);
 886
 887                 drv_remove_interface_debugfs(local, sdata);
 888
 889                 if (going_down)
 890                         drv_remove_interface(local, sdata);
 891         }
 892
 893         sdata->bss = NULL;
 894
 895         mutex_lock(&local->mtx);
 896         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 897         mutex_unlock(&local->mtx);
 898
 899         ieee80211_recalc_ps(local, -1);
 900
 901         if (local->open_count == 0) {
 902                 if (local->ops->napi_poll)
 903                         napi_disable(&local->napi);
 904                 ieee80211_clear_tx_pending(local);
 905                 ieee80211_stop_device(local);
 906
 907                 /* no reconfiguring after stop! */
 908                 hw_reconf_flags = 0;
 909         }
 910
 911         /* do after stop to avoid reconfiguring when we stop anyway */
 912         if (hw_reconf_flags)
 913                 ieee80211_hw_config(local, hw_reconf_flags);
 914
 915         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 916         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 917                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 918                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 919                         if (info->control.vif == &sdata->vif) {
 920                                 __skb_unlink(skb, &local->pending[i]);
 921                                 ieee80211_free_txskb(&local->hw, skb);
 922                         }
 923                 }
 924         }
 925         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 926
 927         if (local->monitors == local->open_count && local->monitors > 0)
 928                 ieee80211_add_virtual_monitor(local);
 929 }
 930
 931 static int ieee80211_stop(struct net_device *dev)
 932 {
 933         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 934
 935         ieee80211_do_stop(sdata, true);
 936
 937         return 0;
 938 }
 939
 940 static void ieee80211_set_multicast_list(struct net_device *dev)
 941 {
 942         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 943         struct ieee80211_local *local = sdata->local;
 944         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 945
 946         allmulti = !!(dev->flags & IFF_ALLMULTI);
 947         promisc = !!(dev->flags & IFF_PROMISC);
 948         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 949         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 950
 951         if (allmulti != sdata_allmulti) {
 952                 if (dev->flags & IFF_ALLMULTI)
 953                         atomic_inc(&local->iff_allmultis);
 954                 else
 955                         atomic_dec(&local->iff_allmultis);
 956                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 957         }
 958
 959         if (promisc != sdata_promisc) {
 960                 if (dev->flags & IFF_PROMISC)
 961                         atomic_inc(&local->iff_promiscs);
 962                 else
 963                         atomic_dec(&local->iff_promiscs);
 964                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 965         }
 966         spin_lock_bh(&local->filter_lock);
 967         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 968         spin_unlock_bh(&local->filter_lock);
 969         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 970 }
 971
 972 /*
 973  * Called when the netdev is removed or, by the code below, before
 974  * the interface type changes.
 975  */
 976 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 977 {
 978         int flushed;
 979         int i;
 980
 981         /* free extra data */
 982         ieee80211_free_keys(sdata);
 983
 984         ieee80211_debugfs_remove_netdev(sdata);
 985
 986         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 987                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 988         sdata->fragment_next = 0;
 989
 990         if (ieee80211_vif_is_mesh(&sdata->vif))
 991                 mesh_rmc_free(sdata);
 992
 993         flushed = sta_info_flush(sdata);
 994         WARN_ON(flushed);
 995 }
 996
 997 static void ieee80211_uninit(struct net_device *dev)
 998 {
 999         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1000 }
1001
1002 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1003                                          struct sk_buff *skb)
1004 {
1005         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1006 }
1007
1008 static const struct net_device_ops ieee80211_dataif_ops = {
1009         .ndo_open               = ieee80211_open,
1010         .ndo_stop               = ieee80211_stop,
1011         .ndo_uninit             = ieee80211_uninit,
1012         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1013         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1014         .ndo_change_mtu         = ieee80211_change_mtu,
1015         .ndo_set_mac_address    = ieee80211_change_mac,
1016         .ndo_select_queue       = ieee80211_netdev_select_queue,
1017 };
1018
1019 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1020                                           struct sk_buff *skb)
1021 {
1022         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1023         struct ieee80211_local *local = sdata->local;
1024         struct ieee80211_hdr *hdr;
1025         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1026
1027         if (local->hw.queues < IEEE80211_NUM_ACS)
1028                 return 0;
1029
1030         if (skb->len < 4 ||
1031             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1032                 return 0; /* doesn't matter, frame will be dropped */
1033
1034         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1035
1036         return ieee80211_select_queue_80211(sdata, skb, hdr);
1037 }
1038
1039 static const struct net_device_ops ieee80211_monitorif_ops = {
1040         .ndo_open               = ieee80211_open,
1041         .ndo_stop               = ieee80211_stop,
1042         .ndo_uninit             = ieee80211_uninit,
1043         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1044         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1045         .ndo_change_mtu         = ieee80211_change_mtu,
1046         .ndo_set_mac_address    = eth_mac_addr,
1047         .ndo_select_queue       = ieee80211_monitor_select_queue,
1048 };
1049
1050 static void ieee80211_if_setup(struct net_device *dev)
1051 {
1052         ether_setup(dev);
1053         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1054         dev->netdev_ops = &ieee80211_dataif_ops;
1055         dev->destructor = free_netdev;
1056 }
1057
1058 static void ieee80211_iface_work(struct work_struct *work)
1059 {
1060         struct ieee80211_sub_if_data *sdata =
1061                 container_of(work, struct ieee80211_sub_if_data, work);
1062         struct ieee80211_local *local = sdata->local;
1063         struct sk_buff *skb;
1064         struct sta_info *sta;
1065         struct ieee80211_ra_tid *ra_tid;
1066
1067         if (!ieee80211_sdata_running(sdata))
1068                 return;
1069
1070         if (local->scanning)
1071                 return;
1072
1073         /*
1074          * ieee80211_queue_work() should have picked up most cases,
1075          * here we'll pick the rest.
1076          */
1077         if (WARN(local->suspended,
1078                  "interface work scheduled while going to suspend\n"))
1079                 return;
1080
1081         /* first process frames */
1082         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1083                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1084
1085                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1086                         ra_tid = (void *)&skb->cb;
1087                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1088                                                  ra_tid->tid);
1089                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1090                         ra_tid = (void *)&skb->cb;
1091                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1092                                                 ra_tid->tid);
1093                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1094                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1095                         int len = skb->len;
1096
1097                         mutex_lock(&local->sta_mtx);
1098                         sta = sta_info_get_bss(sdata, mgmt->sa);
1099                         if (sta) {
1100                                 switch (mgmt->u.action.u.addba_req.action_code) {
1101                                 case WLAN_ACTION_ADDBA_REQ:
1102                                         ieee80211_process_addba_request(
1103                                                         local, sta, mgmt, len);
1104                                         break;
1105                                 case WLAN_ACTION_ADDBA_RESP:
1106                                         ieee80211_process_addba_resp(local, sta,
1107                                                                      mgmt, len);
1108                                         break;
1109                                 case WLAN_ACTION_DELBA:
1110                                         ieee80211_process_delba(sdata, sta,
1111                                                                 mgmt, len);
1112                                         break;
1113                                 default:
1114                                         WARN_ON(1);
1115                                         break;
1116                                 }
1117                         }
1118                         mutex_unlock(&local->sta_mtx);
1119                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1120                         struct ieee80211_hdr *hdr = (void *)mgmt;
1121                         /*
1122                          * So the frame isn't mgmt, but frame_control
1123                          * is at the right place anyway, of course, so
1124                          * the if statement is correct.
1125                          *
1126                          * Warn if we have other data frame types here,
1127                          * they must not get here.
1128                          */
1129                         WARN_ON(hdr->frame_control &
1130                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1131                         WARN_ON(!(hdr->seq_ctrl &
1132                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1133                         /*
1134                          * This was a fragment of a frame, received while
1135                          * a block-ack session was active. That cannot be
1136                          * right, so terminate the session.
1137                          */
1138                         mutex_lock(&local->sta_mtx);
1139                         sta = sta_info_get_bss(sdata, mgmt->sa);
1140                         if (sta) {
1141                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1142                                                 IEEE80211_QOS_CTL_TID_MASK;
1143
1144                                 __ieee80211_stop_rx_ba_session(
1145                                         sta, tid, WLAN_BACK_RECIPIENT,
1146                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1147                                         true);
1148                         }
1149                         mutex_unlock(&local->sta_mtx);
1150                 } else switch (sdata->vif.type) {
1151                 case NL80211_IFTYPE_STATION:
1152                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1153                         break;
1154                 case NL80211_IFTYPE_ADHOC:
1155                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1156                         break;
1157                 case NL80211_IFTYPE_MESH_POINT:
1158                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1159                                 break;
1160                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1161                         break;
1162                 default:
1163                         WARN(1, "frame for unexpected interface type");
1164                         break;
1165                 }
1166
1167                 kfree_skb(skb);
1168         }
1169
1170         /* then other type-dependent work */
1171         switch (sdata->vif.type) {
1172         case NL80211_IFTYPE_STATION:
1173                 ieee80211_sta_work(sdata);
1174                 break;
1175         case NL80211_IFTYPE_ADHOC:
1176                 ieee80211_ibss_work(sdata);
1177                 break;
1178         case NL80211_IFTYPE_MESH_POINT:
1179                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1180                         break;
1181                 ieee80211_mesh_work(sdata);
1182                 break;
1183         default:
1184                 break;
1185         }
1186 }
1187
1188 static void ieee80211_recalc_smps_work(struct work_struct *work)
1189 {
1190         struct ieee80211_sub_if_data *sdata =
1191                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1192
1193         ieee80211_recalc_smps(sdata);
1194 }
1195
1196 /*
1197  * Helper function to initialise an interface to a specific type.
1198  */
1199 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1200                                   enum nl80211_iftype type)
1201 {
1202         /* clear type-dependent union */
1203         memset(&sdata->u, 0, sizeof(sdata->u));
1204
1205         /* and set some type-dependent values */
1206         sdata->vif.type = type;
1207         sdata->vif.p2p = false;
1208         sdata->wdev.iftype = type;
1209
1210         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1211         sdata->control_port_no_encrypt = false;
1212
1213         sdata->noack_map = 0;
1214
1215         /* only monitor/p2p-device differ */
1216         if (sdata->dev) {
1217                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1218                 sdata->dev->type = ARPHRD_ETHER;
1219         }
1220
1221         skb_queue_head_init(&sdata->skb_queue);
1222         INIT_WORK(&sdata->work, ieee80211_iface_work);
1223         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1224
1225         switch (type) {
1226         case NL80211_IFTYPE_P2P_GO:
1227                 type = NL80211_IFTYPE_AP;
1228                 sdata->vif.type = type;
1229                 sdata->vif.p2p = true;
1230                 /* fall through */
1231         case NL80211_IFTYPE_AP:
1232                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1233                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1234                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1235                 break;
1236         case NL80211_IFTYPE_P2P_CLIENT:
1237                 type = NL80211_IFTYPE_STATION;
1238                 sdata->vif.type = type;
1239                 sdata->vif.p2p = true;
1240                 /* fall through */
1241         case NL80211_IFTYPE_STATION:
1242                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1243                 ieee80211_sta_setup_sdata(sdata);
1244                 break;
1245         case NL80211_IFTYPE_ADHOC:
1246                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1247                 ieee80211_ibss_setup_sdata(sdata);
1248                 break;
1249         case NL80211_IFTYPE_MESH_POINT:
1250                 if (ieee80211_vif_is_mesh(&sdata->vif))
1251                         ieee80211_mesh_init_sdata(sdata);
1252                 break;
1253         case NL80211_IFTYPE_MONITOR:
1254                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1255                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1256                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1257                                       MONITOR_FLAG_OTHER_BSS;
1258                 break;
1259         case NL80211_IFTYPE_WDS:
1260                 sdata->vif.bss_conf.bssid = NULL;
1261                 break;
1262         case NL80211_IFTYPE_AP_VLAN:
1263                 break;
1264         case NL80211_IFTYPE_P2P_DEVICE:
1265                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1266                 break;
1267         case NL80211_IFTYPE_UNSPECIFIED:
1268         case NUM_NL80211_IFTYPES:
1269                 BUG();
1270                 break;
1271         }
1272
1273         ieee80211_debugfs_add_netdev(sdata);
1274 }
1275
1276 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1277                                            enum nl80211_iftype type)
1278 {
1279         struct ieee80211_local *local = sdata->local;
1280         int ret, err;
1281         enum nl80211_iftype internal_type = type;
1282         bool p2p = false;
1283
1284         ASSERT_RTNL();
1285
1286         if (!local->ops->change_interface)
1287                 return -EBUSY;
1288
1289         switch (sdata->vif.type) {
1290         case NL80211_IFTYPE_AP:
1291         case NL80211_IFTYPE_STATION:
1292         case NL80211_IFTYPE_ADHOC:
1293                 /*
1294                  * Could maybe also all others here?
1295                  * Just not sure how that interacts
1296                  * with the RX/config path e.g. for
1297                  * mesh.
1298                  */
1299                 break;
1300         default:
1301                 return -EBUSY;
1302         }
1303
1304         switch (type) {
1305         case NL80211_IFTYPE_AP:
1306         case NL80211_IFTYPE_STATION:
1307         case NL80211_IFTYPE_ADHOC:
1308                 /*
1309                  * Could probably support everything
1310                  * but WDS here (WDS do_open can fail
1311                  * under memory pressure, which this
1312                  * code isn't prepared to handle).
1313                  */
1314                 break;
1315         case NL80211_IFTYPE_P2P_CLIENT:
1316                 p2p = true;
1317                 internal_type = NL80211_IFTYPE_STATION;
1318                 break;
1319         case NL80211_IFTYPE_P2P_GO:
1320                 p2p = true;
1321                 internal_type = NL80211_IFTYPE_AP;
1322                 break;
1323         default:
1324                 return -EBUSY;
1325         }
1326
1327         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1328         if (ret)
1329                 return ret;
1330
1331         ieee80211_do_stop(sdata, false);
1332
1333         ieee80211_teardown_sdata(sdata);
1334
1335         ret = drv_change_interface(local, sdata, internal_type, p2p);
1336         if (ret)
1337                 type = sdata->vif.type;
1338
1339         /*
1340          * Ignore return value here, there's not much we can do since
1341          * the driver changed the interface type internally already.
1342          * The warnings will hopefully make driver authors fix it :-)
1343          */
1344         ieee80211_check_queues(sdata);
1345
1346         ieee80211_setup_sdata(sdata, type);
1347
1348         err = ieee80211_do_open(&sdata->wdev, false);
1349         WARN(err, "type change: do_open returned %d", err);
1350
1351         return ret;
1352 }
1353
1354 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1355                              enum nl80211_iftype type)
1356 {
1357         int ret;
1358
1359         ASSERT_RTNL();
1360
1361         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1362                 return 0;
1363
1364         if (ieee80211_sdata_running(sdata)) {
1365                 ret = ieee80211_runtime_change_iftype(sdata, type);
1366                 if (ret)
1367                         return ret;
1368         } else {
1369                 /* Purge and reset type-dependent state. */
1370                 ieee80211_teardown_sdata(sdata);
1371                 ieee80211_setup_sdata(sdata, type);
1372         }
1373
1374         /* reset some values that shouldn't be kept across type changes */
1375         sdata->drop_unencrypted = 0;
1376         if (type == NL80211_IFTYPE_STATION)
1377                 sdata->u.mgd.use_4addr = false;
1378
1379         return 0;
1380 }
1381
1382 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1383                                        u8 *perm_addr, enum nl80211_iftype type)
1384 {
1385         struct ieee80211_sub_if_data *sdata;
1386         u64 mask, start, addr, val, inc;
1387         u8 *m;
1388         u8 tmp_addr[ETH_ALEN];
1389         int i;
1390
1391         /* default ... something at least */
1392         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1393
1394         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1395             local->hw.wiphy->n_addresses <= 1)
1396                 return;
1397
1398         mutex_lock(&local->iflist_mtx);
1399
1400         switch (type) {
1401         case NL80211_IFTYPE_MONITOR:
1402                 /* doesn't matter */
1403                 break;
1404         case NL80211_IFTYPE_WDS:
1405         case NL80211_IFTYPE_AP_VLAN:
1406                 /* match up with an AP interface */
1407                 list_for_each_entry(sdata, &local->interfaces, list) {
1408                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1409                                 continue;
1410                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1411                         break;
1412                 }
1413                 /* keep default if no AP interface present */
1414                 break;
1415         case NL80211_IFTYPE_P2P_CLIENT:
1416         case NL80211_IFTYPE_P2P_GO:
1417                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1418                         list_for_each_entry(sdata, &local->interfaces, list) {
1419                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1420                                         continue;
1421                                 if (!ieee80211_sdata_running(sdata))
1422                                         continue;
1423                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1424                                 goto out_unlock;
1425                         }
1426                 }
1427                 /* otherwise fall through */
1428         default:
1429                 /* assign a new address if possible -- try n_addresses first */
1430                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1431                         bool used = false;
1432
1433                         list_for_each_entry(sdata, &local->interfaces, list) {
1434                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1435                                            sdata->vif.addr, ETH_ALEN) == 0) {
1436                                         used = true;
1437                                         break;
1438                                 }
1439                         }
1440
1441                         if (!used) {
1442                                 memcpy(perm_addr,
1443                                        local->hw.wiphy->addresses[i].addr,
1444                                        ETH_ALEN);
1445                                 break;
1446                         }
1447                 }
1448
1449                 /* try mask if available */
1450                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1451                         break;
1452
1453                 m = local->hw.wiphy->addr_mask;
1454                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1455                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1456                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1457
1458                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1459                         /* not a contiguous mask ... not handled now! */
1460                         pr_info("not contiguous\n");
1461                         break;
1462                 }
1463
1464                 m = local->hw.wiphy->perm_addr;
1465                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1466                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1467                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1468
1469                 inc = 1ULL<<__ffs64(mask);
1470                 val = (start & mask);
1471                 addr = (start & ~mask) | (val & mask);
1472                 do {
1473                         bool used = false;
1474
1475                         tmp_addr[5] = addr >> 0*8;
1476                         tmp_addr[4] = addr >> 1*8;
1477                         tmp_addr[3] = addr >> 2*8;
1478                         tmp_addr[2] = addr >> 3*8;
1479                         tmp_addr[1] = addr >> 4*8;
1480                         tmp_addr[0] = addr >> 5*8;
1481
1482                         val += inc;
1483
1484                         list_for_each_entry(sdata, &local->interfaces, list) {
1485                                 if (memcmp(tmp_addr, sdata->vif.addr,
1486                                                         ETH_ALEN) == 0) {
1487                                         used = true;
1488                                         break;
1489                                 }
1490                         }
1491
1492                         if (!used) {
1493                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1494                                 break;
1495                         }
1496                         addr = (start & ~mask) | (val & mask);
1497                 } while (addr != start);
1498
1499                 break;
1500         }
1501
1502  out_unlock:
1503         mutex_unlock(&local->iflist_mtx);
1504 }
1505
1506 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1507 {
1508         struct ieee80211_sub_if_data *sdata;
1509
1510         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1511
1512         ieee80211_cleanup_sdata_stas(sdata);
1513 }
1514
1515 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1516                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1517                      struct vif_params *params)
1518 {
1519         struct net_device *ndev = NULL;
1520         struct ieee80211_sub_if_data *sdata = NULL;
1521         int ret, i;
1522         int txqs = 1;
1523
1524         ASSERT_RTNL();
1525
1526         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1527                 struct wireless_dev *wdev;
1528
1529                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1530                                 GFP_KERNEL);
1531                 if (!sdata)
1532                         return -ENOMEM;
1533                 wdev = &sdata->wdev;
1534
1535                 sdata->dev = NULL;
1536                 strlcpy(sdata->name, name, IFNAMSIZ);
1537                 ieee80211_assign_perm_addr(local, wdev->address, type);
1538                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1539         } else {
1540                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1541                         txqs = IEEE80211_NUM_ACS;
1542
1543                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1544                                         local->hw.vif_data_size,
1545                                         name, ieee80211_if_setup, txqs, 1);
1546                 if (!ndev)
1547                         return -ENOMEM;
1548                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1549
1550                 ndev->needed_headroom = local->tx_headroom +
1551                                         4*6 /* four MAC addresses */
1552                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1553                                         + 6 /* mesh */
1554                                         + 8 /* rfc1042/bridge tunnel */
1555                                         - ETH_HLEN /* ethernet hard_header_len */
1556                                         + IEEE80211_ENCRYPT_HEADROOM;
1557                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1558
1559                 ret = dev_alloc_name(ndev, ndev->name);
1560                 if (ret < 0) {
1561                         free_netdev(ndev);
1562                         return ret;
1563                 }
1564
1565                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1566                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1567                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1568
1569                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1570                 sdata = netdev_priv(ndev);
1571                 ndev->ieee80211_ptr = &sdata->wdev;
1572                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1573                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1574
1575                 sdata->dev = ndev;
1576         }
1577
1578         /* initialise type-independent data */
1579         sdata->wdev.wiphy = local->hw.wiphy;
1580         sdata->local = local;
1581
1582         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1583                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1584
1585         INIT_LIST_HEAD(&sdata->key_list);
1586
1587         spin_lock_init(&sdata->cleanup_stations_lock);
1588         INIT_LIST_HEAD(&sdata->cleanup_stations);
1589         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1590
1591         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1592                 struct ieee80211_supported_band *sband;
1593                 sband = local->hw.wiphy->bands[i];
1594                 sdata->rc_rateidx_mask[i] =
1595                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1596                 if (sband)
1597                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1598                                sband->ht_cap.mcs.rx_mask,
1599                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1600                 else
1601                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1602                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1603         }
1604
1605         ieee80211_set_default_queues(sdata);
1606
1607         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1608         sdata->user_power_level = local->user_power_level;
1609
1610         /* setup type-dependent data */
1611         ieee80211_setup_sdata(sdata, type);
1612
1613         if (ndev) {
1614                 if (params) {
1615                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1616                         if (type == NL80211_IFTYPE_STATION)
1617                                 sdata->u.mgd.use_4addr = params->use_4addr;
1618                 }
1619
1620                 ndev->features |= local->hw.netdev_features;
1621
1622                 ret = register_netdevice(ndev);
1623                 if (ret) {
1624                         free_netdev(ndev);
1625                         return ret;
1626                 }
1627         }
1628
1629         mutex_lock(&local->iflist_mtx);
1630         list_add_tail_rcu(&sdata->list, &local->interfaces);
1631         mutex_unlock(&local->iflist_mtx);
1632
1633         if (new_wdev)
1634                 *new_wdev = &sdata->wdev;
1635
1636         return 0;
1637 }
1638
1639 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1640 {
1641         ASSERT_RTNL();
1642
1643         mutex_lock(&sdata->local->iflist_mtx);
1644         list_del_rcu(&sdata->list);
1645         mutex_unlock(&sdata->local->iflist_mtx);
1646
1647         synchronize_rcu();
1648
1649         if (sdata->dev) {
1650                 unregister_netdevice(sdata->dev);
1651         } else {
1652                 cfg80211_unregister_wdev(&sdata->wdev);
1653                 kfree(sdata);
1654         }
1655 }
1656
1657 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1658 {
1659         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1660                 return;
1661         ieee80211_do_stop(sdata, true);
1662         ieee80211_teardown_sdata(sdata);
1663 }
1664
1665 /*
1666  * Remove all interfaces, may only be called at hardware unregistration
1667  * time because it doesn't do RCU-safe list removals.
1668  */
1669 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1670 {
1671         struct ieee80211_sub_if_data *sdata, *tmp;
1672         LIST_HEAD(unreg_list);
1673         LIST_HEAD(wdev_list);
1674
1675         ASSERT_RTNL();
1676
1677         mutex_lock(&local->iflist_mtx);
1678         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1679                 list_del(&sdata->list);
1680
1681                 if (sdata->dev)
1682                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1683                 else
1684                         list_add(&sdata->list, &wdev_list);
1685         }
1686         mutex_unlock(&local->iflist_mtx);
1687         unregister_netdevice_many(&unreg_list);
1688         list_del(&unreg_list);
1689
1690         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1691                 list_del(&sdata->list);
1692                 cfg80211_unregister_wdev(&sdata->wdev);
1693                 kfree(sdata);
1694         }
1695 }
1696
1697 static int netdev_notify(struct notifier_block *nb,
1698                          unsigned long state,
1699                          void *ndev)
1700 {
1701         struct net_device *dev = ndev;
1702         struct ieee80211_sub_if_data *sdata;
1703
1704         if (state != NETDEV_CHANGENAME)
1705                 return 0;
1706
1707         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1708                 return 0;
1709
1710         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1711                 return 0;
1712
1713         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1714
1715         memcpy(sdata->name, dev->name, IFNAMSIZ);
1716
1717         ieee80211_debugfs_rename_netdev(sdata);
1718         return 0;
1719 }
1720
1721 static struct notifier_block mac80211_netdev_notifier = {
1722         .notifier_call = netdev_notify,
1723 };
1724
1725 int ieee80211_iface_init(void)
1726 {
1727         return register_netdevice_notifier(&mac80211_netdev_notifier);
1728 }
1729
1730 void ieee80211_iface_exit(void)
1731 {
1732         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1733 }